You use the Disable Doodad state action on them, and have some dtectors owned by human players near them for a few seconds. First place the hatches, then place some observers owned by human players next to it, then do this
QUOTE
Players
- Whomever
Conditions
- Always?
Actions
- Disable doodad state for floor hatch owned by P8 at floor hatch location
- wait 400 milliseconds
- Remove observers for human players at Floor Hatch location
then this one to make it shimmer
QUOTE
Players
- p8
Conditions
- make heat wave conds
Actions
- toggle doodad state fro floor hatch for p8 at Floor Hatch Location
- preserve trigger